Strap system for a shoe upper



FIG. 1 is a side elevational view of one side of a strap system for a shoe upper showing my new design;

FIG. 2 is a side elevational view of the other side of the strap system shown in FIG. 1;

FIG. 3 is a front elevational view of the strap system shown in FIG. 1;

FIG. 4 is a rear elevational view of the strap system shown in FIG. 1; and,

FIG. 5 is a top plan view of the strap system shown in FIG. 1.

The broken line showing of a shoe upper and sole periphery in the figures are for illustrative purposes and form no part of the claimed design. 

The ornamental design for a strap system for a shoe upper, as shown and described. 